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为了满足美国联邦通信委员会(Federal Communication Commission,FCC)室内频谱规范,脉冲波形设计问题成为研究热点之一。本文主要基于频移高斯波形(spectrum shifted Gaussian waveforms,SSGW)方法,即将基本高斯脉冲与不同正弦载波相乘,然后加权求和产生符合频谱掩模的脉冲。该方法能根据预设条件设计满足不同功率谱掩模规范的脉冲,具有显著的灵活性,但其加权系数调整过程存在计算量和误差过大的缺点。因此,本文引入随机选择(Random Selection,RS)算法和LSE(Least Square Error)算法求得加权系数。理论分析及仿真结果表明,与高斯导函数组合方法相比,改进SSGW方法具有更高的频谱利用率且生成脉冲在信号传输性能方面得到改善。
In order to meet the Federal Communications Commission (FCC) indoor spectrum specifications, pulse waveform design has become one of the hot topics. This article is based mainly on the spectrum-shifted Gaussian waveforms (SSGW) method, which multiplies basic Gaussian pulses with different sinusoidal carriers and then weighted sums to generate pulses that conform to the spectral mask. The method can design the pulse which meets the different power spectrum mask specifications according to the preconditions, and has obvious flexibility. However, the weighting coefficient adjustment process has the disadvantages of large calculation and error. Therefore, this paper introduces the Random Selection (RS) algorithm and LSE (Least Square Error) algorithm to obtain the weighted coefficients. Theoretical analysis and simulation results show that, compared with the Gaussian derivative method, the improved SSGW method has higher spectral efficiency and the generated pulse is improved in signal transmission performance.